CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
EPSS
Percentile
94.3%
The Yahoo Messenger YMailAttach ActiveX control contains a buffer overflow, which could allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.
Yahoo Messenger is an instant messaging application. Yahoo Messenger includes several ActiveX controls. The YMailAttach ActiveX control, which is provided by ymmapi.dll
, contains a buffer overflow vulnerability.
By convincing a user to view a specially crafted HTML document (e.g., a web page or an HTML email message or attachment), an attacker may be able to execute arbitrary code with the privileges of the user. The attacker could also cause Internet Explorer (or the program using the WebBrowser control) to crash.
Apply an update
As specified in the Yahoo Security Update, this issue is addressed in versions of Yahoo Messenger from Nov 2nd 2006 or later. Version 2005.1.1.4
or higher of ymmapi.dll
contains the fix.
Disable the YMailAttach ActiveX control in Internet Explorer
The Yahoo YMailAttach ActiveX control can be disabled in Internet Explorer by setting the kill bit for the following CLSID:
{AA218328-0EA8-4D70-8972-E987A9190FF4}
More information about how to set the kill bit is available in Microsoft Support Document 240797. Alternatively, the following text can be saved as a .REG
file and imported to set the kill bit for this control:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\``{AA218328-0EA8-4D70-8972-E987A9190FF4}``]
"Compatibility Flags"=dword:00000400
Disable ActiveX
Disabling ActiveX controls in the Internet Zone (or any zone used by an attacker) appears to prevent exploitation of this and other ActiveX vulnerabilities. Instructions for disabling ActiveX in the Internet Zone can be found in the "Securing Your Web Browser" document.
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Updated: December 15, 2006
Affected
We have not received a statement from the vendor.
The vendor has not provided us with any further information regarding this vulnerability.
Please see the Yahoo Security Update.
If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23901852 Feedback>).
Group | Score | Vector |
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Base | ||
Temporal | ||
Environmental |
Thanks to Yahoo for reporting this vulnerability.
This document was written by Will Dormann.
CVE IDs: | CVE-2006-6603 |
---|---|
Severity Metric: | 27.95 Date Public: |